Hi Joan,
The gel is the same stuff as the Dr. Scholl’s gel shoe inserts.
It’s nice…poses no problems, but does nothing to enhance memory foam.
The Simmons Black models doesn’t have standard memory foam. It’s Simmons’ Next Generation memory foam and

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We bought this new from RC Willey in 2013 and it’s already so broken down that it feels like sleeping on a hammock. I am wildly disappointed in my “never sag” $2,111 mattress, and will never spend that on a inter-coil mattress EVER again. RC Willey is sending out inspectors this week to look at it, and I suspect they are ever the consummate rejecters of claims, but I don’t want to front load my expectations to much. Unfortunately when you read about warranty rejections they seem to run the gambit.